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June 26, 923r 1,459,895

E. L. IVES BLAST FURNACE STOCK LINE PROTECTION Filed Oct. 24 1921Patented June 26, |923.

UNITED STATES PATENT OFF-ICE.

EDWARD L, IVES, OF CHICAGO, ILLINOIS, ASSIGNR T FREYN. BRASSERT & COM-PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BLASTFURNACE STOCK-LINE PROTECTION.

Application flied october 24, 1921. sierial No. 509,774.

havingr stock line protcctin,rr plates, 1u the accompanyingr drawings,in whichi Figure, liis a. somewhat diagrammatic cross section of a blastfurnace; and

Figure 2 is a fragmentary section on an enlarged scale showing the stockline protec-tion.

As shown in the drawings, the upper portion or stock line section 3 ofthe furnace is provided with the wear plates t havine flanges 5extending in ardly of the lin-ich work to anchor the plates thereto.'lhe plates are placed a small distance apart in order to provide fortheir expansion when heated. The top o he furnace is provided with thehopper 6, the lower portion ot' which is closed byithe hell 7. It is tohe understood that in the operation of the furnace, a, charge of ore.stone or coke is placed in the hopper G and then is dumped 'into thefurnace by lowering the bell 7. The bell 7 is operated by well knownmeans which form no part of the present invew tion and have not beenshown. This hell distributes the charge. throughout the crcumference ofthe furnace throwing it against the. plates 4 protectincr the stockline. y

These plates are formed of a steel having added thereto manganese. inpercentagns rurr ning over 3%. The addition ol' this manA gallesehas-heen shown hy experience to forni a steel which resists wear iu thisapplication far better than ordinary steel or cast iron. This manganesesteel contains less than lj, yi of carbon and has the necessary hardnessand strength to withstand the wear and tear To HU fr/mm it may concern.'

lo it` known that l, [Comuni L. Ives, a citizen of the l'nited AQtates.,residing at (laicago. in the county ot @ook and State ol' lllinoh. hanlinvented certain new I.1nd useful improvements in l last-If`urn:1CoStoclehiuc Protections, ot' which the following is a specification.

'l'his invention relates to a new and inlprovcd nic-ans for protectingrthe top portion of blast furnaces known as the stoel( line, and moreparticularly to a composition of metal adapted for use in suchprotection.

As is well known in the art` a hlast furnace is lined with refractoryhrick to resist the heat action of combustion` The colte. ore andlimestone or other tluxng material are introduced into the furnace fromabove, and in the usual form. this material distributed hv means of ahell. This hell throws the material against the sides of a furnaceadjacent the top. This portion of the furnace is known the stock lineand protecting means must he provided or otherwise the hricltr walls arerapidly worn away by the action of the materials implnging against them.It has been common practice to protect this portion of the furnacel bymeans of cast iron or steel plates or hy a continuousrinlg'v of castiron or steel. These methods of protection have not been satisfactory(lue to the qualities of materials used. If cast iron is used, with itshigh carbon content, the. metal is' soft and the carbon which amounts toabout 4% is gradually eliminated from the metal causing deteriorationand weakening thertI- ot. If steel is used in which the carhon to whichthe stock line of the furnace is intent has heen reduced to H fj or'lower` subjected. the metal is so soft that it is easily worn I claim:

1. In a blast furnace, protectincr plates lo` cated at the stock linethereof, said plates containingrr in excess of three per cent ofmanganese. i2. In a. blast furnace, steel protecting plates located atthe stock line thereof, -said plates containingr less than one andonehalf per cent of carbon and in excess of three per cent of manganese.

Signed at Chicago, Illinois, this th dav of October, 1921.

It is an object of my invention to provide a material for stock linewear plates which is adapted to ,give the necessary strength andesistalu'e to wear and ahrasion.

lt is a further object to provide material '.l' great hardness andtoughness whereby the protecting plates may be made relatively iight andwhereby their cost is reduced.

Other and further objects will appear aus the description proceeds.

In order to make clear the application of my invention, I have shown a.blast furnace EDWARD l., lVllS.

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